A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 268
B, and A is the radiant point from which thelays «,/*, c, &c., diverge. After passing throughthe lens they will converge and meet in a focalpoint, as at C. The farther A is from B the nearerwill C be to it. 388. Rays diverging from a radiant point be-tween a convex lens and its focus will… … in which A is the radiating point from which therays «, b, c. Ike, diverge, and F is the focus ofthe lens B. These rays, after passing throughthe lens, continue to diverge in the space C D.389. The focus of the suns parallel rays, whentransmitted through a double convex lens, isshown in the annexed…
Encyclopedias and dictionaries · Aeronautics
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
